Victron has a different product with physical pre-alarm output. this one has no pre-alarm, as pictured? why title and description is wrong?

You may be confusing this item with the bigger BMS units by Victron. I assure you this unit is a miniBMS unit with a pre-Alarm system built in to a smaller form factor unit and size. To prove it look at the following link from Victron's website and if you think they are wrong in their title and description please feel free to bring it up with them. https://www.victronenergy.com/battery-management-systems/minibms

I built a 5p 4s lfp battery out of 10 amp hour headway lfp cells, 20 of them. i need a reliable bms. is there some way i can make the connections?

I would recommend the larger BMS for that type of setup.

Wrong product? it's without pre-alarm. title and description is incorrect

No its not. The pre-alarm function is fulfilled by the LED's and the pattern in which they blink giving you an error code. If you want the alarm to go off as a buzzer, siren, or email notification that's what the alarm outputs are for. It is on the consumer to install those extra items themselves.

Item Package Dimensions L x W x H	6.77 x 5.51 x 1.97 inches
Package Weight	0.12 Kilograms
Item Dimensions LxWxH	4.17 x 1.65 x 0.91 inches
Item Weight	1 Grams
Brand Name	Victron Energy
Warranty Description	Warranty
Model Name	Victoron_Energy Unisex Adult NBA-540 SMALLBMS, Multicoloured, Mini BMS BMS400100000
Color	multi-coloured
Material	Plastic
Suggested Users	unisex-adult
Number of Items	1
Manufacturer	VICTRON_ENERGY
Part Number	BMS400100000
Included Components	Victoron_Energy Unisex Adult NBA-540 SMALLBMS, Multicoloured, Mini BMS BMS400100000
Size	Mini BMS BMS400100000

smallBMS with pre-alarm

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